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When electricity was discovered scientists tried many experiments to find out which way the electricity was flowing around circuits. In those early days they found it was impossible to determine the direction of flow.

By the time the electron was discovered the idea of electricity flowing from positive to negative (conventional current) was firmly established. Luckily it is not a problem to think of electricity in this way because positive charge flowing forwards is equivalent to negative charge flowing backwards.

We say that electricity flows from the positive (+) terminal of a battery to the negative (-) terminal of the battery. We can imagine particles with positive electric charge flowing in this direction around the circuit, like the red dots in the diagram.

I recommend Electronics for Kids as a good introduction to electricity and electronics. Printed in full colour with many illustrations, it introduces common components with simple but interesting projects to build at each stage. The book starts by assuming no previous knowledge then carefully builds up straightforward explanations of how components work, plus practical techniques including wire-stripping, soldering and using a multimeter.